| 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | #include <linux/capability.h> |
| 3 | #include <linux/compat.h> |
| 4 | #include <linux/blkdev.h> |
| 5 | #include <linux/export.h> |
| 6 | #include <linux/gfp.h> |
| 7 | #include <linux/blkpg.h> |
| 8 | #include <linux/hdreg.h> |
| 9 | #include <linux/backing-dev.h> |
| 10 | #include <linux/fs.h> |
| 11 | #include <linux/blktrace_api.h> |
| 12 | #include <linux/pr.h> |
| 13 | #include <linux/uaccess.h> |
| 14 | #include "blk.h" |
| 15 | |
| 16 | static int blkpg_do_ioctl(struct block_device *bdev, |
| 17 | struct blkpg_partition __user *upart, int op) |
| 18 | { |
| 19 | struct gendisk *disk = bdev->bd_disk; |
| 20 | struct blkpg_partition p; |
| 21 | long long start, length; |
| 22 | |
| 23 | if (!capable(CAP_SYS_ADMIN)) |
| 24 | return -EACCES; |
| 25 | if (copy_from_user(&p, upart, sizeof(struct blkpg_partition))) |
| 26 | return -EFAULT; |
| 27 | if (bdev_is_partition(bdev)) |
| 28 | return -EINVAL; |
| 29 | |
| 30 | if (p.pno <= 0) |
| 31 | return -EINVAL; |
| 32 | |
| 33 | if (op == BLKPG_DEL_PARTITION) |
| 34 | return bdev_del_partition(disk, p.pno); |
| 35 | |
| 36 | start = p.start >> SECTOR_SHIFT; |
| 37 | length = p.length >> SECTOR_SHIFT; |
| 38 | |
| 39 | switch (op) { |
| 40 | case BLKPG_ADD_PARTITION: |
| 41 | /* check if partition is aligned to blocksize */ |
| 42 | if (p.start & (bdev_logical_block_size(bdev) - 1)) |
| 43 | return -EINVAL; |
| 44 | return bdev_add_partition(disk, p.pno, start, length); |
| 45 | case BLKPG_RESIZE_PARTITION: |
| 46 | return bdev_resize_partition(disk, p.pno, start, length); |
| 47 | default: |
| 48 | return -EINVAL; |
| 49 | } |
| 50 | } |
| 51 | |
| 52 | static int blkpg_ioctl(struct block_device *bdev, |
| 53 | struct blkpg_ioctl_arg __user *arg) |
| 54 | { |
| 55 | struct blkpg_partition __user *udata; |
| 56 | int op; |
| 57 | |
| 58 | if (get_user(op, &arg->op) || get_user(udata, &arg->data)) |
| 59 | return -EFAULT; |
| 60 | |
| 61 | return blkpg_do_ioctl(bdev, udata, op); |
| 62 | } |
| 63 | |
| 64 | #ifdef CONFIG_COMPAT |
| 65 | struct compat_blkpg_ioctl_arg { |
| 66 | compat_int_t op; |
| 67 | compat_int_t flags; |
| 68 | compat_int_t datalen; |
| 69 | compat_caddr_t data; |
| 70 | }; |
| 71 | |
| 72 | static int compat_blkpg_ioctl(struct block_device *bdev, |
| 73 | struct compat_blkpg_ioctl_arg __user *arg) |
| 74 | { |
| 75 | compat_caddr_t udata; |
| 76 | int op; |
| 77 | |
| 78 | if (get_user(op, &arg->op) || get_user(udata, &arg->data)) |
| 79 | return -EFAULT; |
| 80 | |
| 81 | return blkpg_do_ioctl(bdev, compat_ptr(udata), op); |
| 82 | } |
| 83 | #endif |
| 84 | |
| 85 | static int blk_ioctl_discard(struct block_device *bdev, fmode_t mode, |
| 86 | unsigned long arg) |
| 87 | { |
| 88 | uint64_t range[2]; |
| 89 | uint64_t start, len; |
| 90 | struct inode *inode = bdev->bd_inode; |
| 91 | int err; |
| 92 | |
| 93 | if (!(mode & FMODE_WRITE)) |
| 94 | return -EBADF; |
| 95 | |
| 96 | if (!bdev_max_discard_sectors(bdev)) |
| 97 | return -EOPNOTSUPP; |
| 98 | |
| 99 | if (copy_from_user(range, (void __user *)arg, sizeof(range))) |
| 100 | return -EFAULT; |
| 101 | |
| 102 | start = range[0]; |
| 103 | len = range[1]; |
| 104 | |
| 105 | if (start & 511) |
| 106 | return -EINVAL; |
| 107 | if (len & 511) |
| 108 | return -EINVAL; |
| 109 | |
| 110 | if (start + len > bdev_nr_bytes(bdev)) |
| 111 | return -EINVAL; |
| 112 | |
| 113 | filemap_invalidate_lock(inode->i_mapping); |
| 114 | err = truncate_bdev_range(bdev, mode, start, start + len - 1); |
| 115 | if (err) |
| 116 | goto fail; |
| 117 | err = blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_KERNEL); |
| 118 | fail: |
| 119 | filemap_invalidate_unlock(inode->i_mapping); |
| 120 | return err; |
| 121 | } |
| 122 | |
| 123 | static int blk_ioctl_secure_erase(struct block_device *bdev, fmode_t mode, |
| 124 | void __user *argp) |
| 125 | { |
| 126 | uint64_t start, len; |
| 127 | uint64_t range[2]; |
| 128 | int err; |
| 129 | |
| 130 | if (!(mode & FMODE_WRITE)) |
| 131 | return -EBADF; |
| 132 | if (!bdev_max_secure_erase_sectors(bdev)) |
| 133 | return -EOPNOTSUPP; |
| 134 | if (copy_from_user(range, argp, sizeof(range))) |
| 135 | return -EFAULT; |
| 136 | |
| 137 | start = range[0]; |
| 138 | len = range[1]; |
| 139 | if ((start & 511) || (len & 511)) |
| 140 | return -EINVAL; |
| 141 | if (start + len > bdev_nr_bytes(bdev)) |
| 142 | return -EINVAL; |
| 143 | |
| 144 | filemap_invalidate_lock(bdev->bd_inode->i_mapping); |
| 145 | err = truncate_bdev_range(bdev, mode, start, start + len - 1); |
| 146 | if (!err) |
| 147 | err = blkdev_issue_secure_erase(bdev, start >> 9, len >> 9, |
| 148 | GFP_KERNEL); |
| 149 | filemap_invalidate_unlock(bdev->bd_inode->i_mapping); |
| 150 | return err; |
| 151 | } |
| 152 | |
| 153 | |
| 154 | static int blk_ioctl_zeroout(struct block_device *bdev, fmode_t mode, |
| 155 | unsigned long arg) |
| 156 | { |
| 157 | uint64_t range[2]; |
| 158 | uint64_t start, end, len; |
| 159 | struct inode *inode = bdev->bd_inode; |
| 160 | int err; |
| 161 | |
| 162 | if (!(mode & FMODE_WRITE)) |
| 163 | return -EBADF; |
| 164 | |
| 165 | if (copy_from_user(range, (void __user *)arg, sizeof(range))) |
| 166 | return -EFAULT; |
| 167 | |
| 168 | start = range[0]; |
| 169 | len = range[1]; |
| 170 | end = start + len - 1; |
| 171 | |
| 172 | if (start & 511) |
| 173 | return -EINVAL; |
| 174 | if (len & 511) |
| 175 | return -EINVAL; |
| 176 | if (end >= (uint64_t)bdev_nr_bytes(bdev)) |
| 177 | return -EINVAL; |
| 178 | if (end < start) |
| 179 | return -EINVAL; |
| 180 | |
| 181 | /* Invalidate the page cache, including dirty pages */ |
| 182 | filemap_invalidate_lock(inode->i_mapping); |
| 183 | err = truncate_bdev_range(bdev, mode, start, end); |
| 184 | if (err) |
| 185 | goto fail; |
| 186 | |
| 187 | err = blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL, |
| 188 | BLKDEV_ZERO_NOUNMAP); |
| 189 | |
| 190 | fail: |
| 191 | filemap_invalidate_unlock(inode->i_mapping); |
| 192 | return err; |
| 193 | } |
| 194 | |
| 195 | static int put_ushort(unsigned short __user *argp, unsigned short val) |
| 196 | { |
| 197 | return put_user(val, argp); |
| 198 | } |
| 199 | |
| 200 | static int put_int(int __user *argp, int val) |
| 201 | { |
| 202 | return put_user(val, argp); |
| 203 | } |
| 204 | |
| 205 | static int put_uint(unsigned int __user *argp, unsigned int val) |
| 206 | { |
| 207 | return put_user(val, argp); |
| 208 | } |
| 209 | |
| 210 | static int put_long(long __user *argp, long val) |
| 211 | { |
| 212 | return put_user(val, argp); |
| 213 | } |
| 214 | |
| 215 | static int put_ulong(unsigned long __user *argp, unsigned long val) |
| 216 | { |
| 217 | return put_user(val, argp); |
| 218 | } |
| 219 | |
| 220 | static int put_u64(u64 __user *argp, u64 val) |
| 221 | { |
| 222 | return put_user(val, argp); |
| 223 | } |
| 224 | |
| 225 | #ifdef CONFIG_COMPAT |
| 226 | static int compat_put_long(compat_long_t __user *argp, long val) |
| 227 | { |
| 228 | return put_user(val, argp); |
| 229 | } |
| 230 | |
| 231 | static int compat_put_ulong(compat_ulong_t __user *argp, compat_ulong_t val) |
| 232 | { |
| 233 | return put_user(val, argp); |
| 234 | } |
| 235 | #endif |
| 236 | |
| 237 | #ifdef CONFIG_COMPAT |
| 238 | /* |
| 239 | * This is the equivalent of compat_ptr_ioctl(), to be used by block |
| 240 | * drivers that implement only commands that are completely compatible |
| 241 | * between 32-bit and 64-bit user space |
| 242 | */ |
| 243 | int blkdev_compat_ptr_ioctl(struct block_device *bdev, fmode_t mode, |
| 244 | unsigned cmd, unsigned long arg) |
| 245 | { |
| 246 | struct gendisk *disk = bdev->bd_disk; |
| 247 | |
| 248 | if (disk->fops->ioctl) |
| 249 | return disk->fops->ioctl(bdev, mode, cmd, |
| 250 | (unsigned long)compat_ptr(arg)); |
| 251 | |
| 252 | return -ENOIOCTLCMD; |
| 253 | } |
| 254 | EXPORT_SYMBOL(blkdev_compat_ptr_ioctl); |
| 255 | #endif |
| 256 | |
| 257 | static int blkdev_pr_register(struct block_device *bdev, |
| 258 | struct pr_registration __user *arg) |
| 259 | { |
| 260 | const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; |
| 261 | struct pr_registration reg; |
| 262 | |
| 263 | if (!capable(CAP_SYS_ADMIN)) |
| 264 | return -EPERM; |
| 265 | if (!ops || !ops->pr_register) |
| 266 | return -EOPNOTSUPP; |
| 267 | if (copy_from_user(®, arg, sizeof(reg))) |
| 268 | return -EFAULT; |
| 269 | |
| 270 | if (reg.flags & ~PR_FL_IGNORE_KEY) |
| 271 | return -EOPNOTSUPP; |
| 272 | return ops->pr_register(bdev, reg.old_key, reg.new_key, reg.flags); |
| 273 | } |
| 274 | |
| 275 | static int blkdev_pr_reserve(struct block_device *bdev, |
| 276 | struct pr_reservation __user *arg) |
| 277 | { |
| 278 | const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; |
| 279 | struct pr_reservation rsv; |
| 280 | |
| 281 | if (!capable(CAP_SYS_ADMIN)) |
| 282 | return -EPERM; |
| 283 | if (!ops || !ops->pr_reserve) |
| 284 | return -EOPNOTSUPP; |
| 285 | if (copy_from_user(&rsv, arg, sizeof(rsv))) |
| 286 | return -EFAULT; |
| 287 | |
| 288 | if (rsv.flags & ~PR_FL_IGNORE_KEY) |
| 289 | return -EOPNOTSUPP; |
| 290 | return ops->pr_reserve(bdev, rsv.key, rsv.type, rsv.flags); |
| 291 | } |
| 292 | |
| 293 | static int blkdev_pr_release(struct block_device *bdev, |
| 294 | struct pr_reservation __user *arg) |
| 295 | { |
| 296 | const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; |
| 297 | struct pr_reservation rsv; |
| 298 | |
| 299 | if (!capable(CAP_SYS_ADMIN)) |
| 300 | return -EPERM; |
| 301 | if (!ops || !ops->pr_release) |
| 302 | return -EOPNOTSUPP; |
| 303 | if (copy_from_user(&rsv, arg, sizeof(rsv))) |
| 304 | return -EFAULT; |
| 305 | |
| 306 | if (rsv.flags) |
| 307 | return -EOPNOTSUPP; |
| 308 | return ops->pr_release(bdev, rsv.key, rsv.type); |
| 309 | } |
| 310 | |
| 311 | static int blkdev_pr_preempt(struct block_device *bdev, |
| 312 | struct pr_preempt __user *arg, bool abort) |
| 313 | { |
| 314 | const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; |
| 315 | struct pr_preempt p; |
| 316 | |
| 317 | if (!capable(CAP_SYS_ADMIN)) |
| 318 | return -EPERM; |
| 319 | if (!ops || !ops->pr_preempt) |
| 320 | return -EOPNOTSUPP; |
| 321 | if (copy_from_user(&p, arg, sizeof(p))) |
| 322 | return -EFAULT; |
| 323 | |
| 324 | if (p.flags) |
| 325 | return -EOPNOTSUPP; |
| 326 | return ops->pr_preempt(bdev, p.old_key, p.new_key, p.type, abort); |
| 327 | } |
| 328 | |
| 329 | static int blkdev_pr_clear(struct block_device *bdev, |
| 330 | struct pr_clear __user *arg) |
| 331 | { |
| 332 | const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; |
| 333 | struct pr_clear c; |
| 334 | |
| 335 | if (!capable(CAP_SYS_ADMIN)) |
| 336 | return -EPERM; |
| 337 | if (!ops || !ops->pr_clear) |
| 338 | return -EOPNOTSUPP; |
| 339 | if (copy_from_user(&c, arg, sizeof(c))) |
| 340 | return -EFAULT; |
| 341 | |
| 342 | if (c.flags) |
| 343 | return -EOPNOTSUPP; |
| 344 | return ops->pr_clear(bdev, c.key); |
| 345 | } |
| 346 | |
| 347 | static int blkdev_flushbuf(struct block_device *bdev, fmode_t mode, |
| 348 | unsigned cmd, unsigned long arg) |
| 349 | { |
| 350 | if (!capable(CAP_SYS_ADMIN)) |
| 351 | return -EACCES; |
| 352 | fsync_bdev(bdev); |
| 353 | invalidate_bdev(bdev); |
| 354 | return 0; |
| 355 | } |
| 356 | |
| 357 | static int blkdev_roset(struct block_device *bdev, fmode_t mode, |
| 358 | unsigned cmd, unsigned long arg) |
| 359 | { |
| 360 | int ret, n; |
| 361 | |
| 362 | if (!capable(CAP_SYS_ADMIN)) |
| 363 | return -EACCES; |
| 364 | |
| 365 | if (get_user(n, (int __user *)arg)) |
| 366 | return -EFAULT; |
| 367 | if (bdev->bd_disk->fops->set_read_only) { |
| 368 | ret = bdev->bd_disk->fops->set_read_only(bdev, n); |
| 369 | if (ret) |
| 370 | return ret; |
| 371 | } |
| 372 | bdev->bd_read_only = n; |
| 373 | return 0; |
| 374 | } |
| 375 | |
| 376 | static int blkdev_getgeo(struct block_device *bdev, |
| 377 | struct hd_geometry __user *argp) |
| 378 | { |
| 379 | struct gendisk *disk = bdev->bd_disk; |
| 380 | struct hd_geometry geo; |
| 381 | int ret; |
| 382 | |
| 383 | if (!argp) |
| 384 | return -EINVAL; |
| 385 | if (!disk->fops->getgeo) |
| 386 | return -ENOTTY; |
| 387 | |
| 388 | /* |
| 389 | * We need to set the startsect first, the driver may |
| 390 | * want to override it. |
| 391 | */ |
| 392 | memset(&geo, 0, sizeof(geo)); |
| 393 | geo.start = get_start_sect(bdev); |
| 394 | ret = disk->fops->getgeo(bdev, &geo); |
| 395 | if (ret) |
| 396 | return ret; |
| 397 | if (copy_to_user(argp, &geo, sizeof(geo))) |
| 398 | return -EFAULT; |
| 399 | return 0; |
| 400 | } |
| 401 | |
| 402 | #ifdef CONFIG_COMPAT |
| 403 | struct compat_hd_geometry { |
| 404 | unsigned char heads; |
| 405 | unsigned char sectors; |
| 406 | unsigned short cylinders; |
| 407 | u32 start; |
| 408 | }; |
| 409 | |
| 410 | static int compat_hdio_getgeo(struct block_device *bdev, |
| 411 | struct compat_hd_geometry __user *ugeo) |
| 412 | { |
| 413 | struct gendisk *disk = bdev->bd_disk; |
| 414 | struct hd_geometry geo; |
| 415 | int ret; |
| 416 | |
| 417 | if (!ugeo) |
| 418 | return -EINVAL; |
| 419 | if (!disk->fops->getgeo) |
| 420 | return -ENOTTY; |
| 421 | |
| 422 | memset(&geo, 0, sizeof(geo)); |
| 423 | /* |
| 424 | * We need to set the startsect first, the driver may |
| 425 | * want to override it. |
| 426 | */ |
| 427 | geo.start = get_start_sect(bdev); |
| 428 | ret = disk->fops->getgeo(bdev, &geo); |
| 429 | if (ret) |
| 430 | return ret; |
| 431 | |
| 432 | ret = copy_to_user(ugeo, &geo, 4); |
| 433 | ret |= put_user(geo.start, &ugeo->start); |
| 434 | if (ret) |
| 435 | ret = -EFAULT; |
| 436 | |
| 437 | return ret; |
| 438 | } |
| 439 | #endif |
| 440 | |
| 441 | /* set the logical block size */ |
| 442 | static int blkdev_bszset(struct block_device *bdev, fmode_t mode, |
| 443 | int __user *argp) |
| 444 | { |
| 445 | int ret, n; |
| 446 | |
| 447 | if (!capable(CAP_SYS_ADMIN)) |
| 448 | return -EACCES; |
| 449 | if (!argp) |
| 450 | return -EINVAL; |
| 451 | if (get_user(n, argp)) |
| 452 | return -EFAULT; |
| 453 | |
| 454 | if (mode & FMODE_EXCL) |
| 455 | return set_blocksize(bdev, n); |
| 456 | |
| 457 | if (IS_ERR(blkdev_get_by_dev(bdev->bd_dev, mode | FMODE_EXCL, &bdev))) |
| 458 | return -EBUSY; |
| 459 | ret = set_blocksize(bdev, n); |
| 460 | blkdev_put(bdev, mode | FMODE_EXCL); |
| 461 | |
| 462 | return ret; |
| 463 | } |
| 464 | |
| 465 | /* |
| 466 | * Common commands that are handled the same way on native and compat |
| 467 | * user space. Note the separate arg/argp parameters that are needed |
| 468 | * to deal with the compat_ptr() conversion. |
| 469 | */ |
| 470 | static int blkdev_common_ioctl(struct block_device *bdev, fmode_t mode, |
| 471 | unsigned int cmd, unsigned long arg, |
| 472 | void __user *argp) |
| 473 | { |
| 474 | unsigned int max_sectors; |
| 475 | |
| 476 | switch (cmd) { |
| 477 | case BLKFLSBUF: |
| 478 | return blkdev_flushbuf(bdev, mode, cmd, arg); |
| 479 | case BLKROSET: |
| 480 | return blkdev_roset(bdev, mode, cmd, arg); |
| 481 | case BLKDISCARD: |
| 482 | return blk_ioctl_discard(bdev, mode, arg); |
| 483 | case BLKSECDISCARD: |
| 484 | return blk_ioctl_secure_erase(bdev, mode, argp); |
| 485 | case BLKZEROOUT: |
| 486 | return blk_ioctl_zeroout(bdev, mode, arg); |
| 487 | case BLKGETDISKSEQ: |
| 488 | return put_u64(argp, bdev->bd_disk->diskseq); |
| 489 | case BLKREPORTZONE: |
| 490 | return blkdev_report_zones_ioctl(bdev, mode, cmd, arg); |
| 491 | case BLKRESETZONE: |
| 492 | case BLKOPENZONE: |
| 493 | case BLKCLOSEZONE: |
| 494 | case BLKFINISHZONE: |
| 495 | return blkdev_zone_mgmt_ioctl(bdev, mode, cmd, arg); |
| 496 | case BLKGETZONESZ: |
| 497 | return put_uint(argp, bdev_zone_sectors(bdev)); |
| 498 | case BLKGETNRZONES: |
| 499 | return put_uint(argp, bdev_nr_zones(bdev)); |
| 500 | case BLKROGET: |
| 501 | return put_int(argp, bdev_read_only(bdev) != 0); |
| 502 | case BLKSSZGET: /* get block device logical block size */ |
| 503 | return put_int(argp, bdev_logical_block_size(bdev)); |
| 504 | case BLKPBSZGET: /* get block device physical block size */ |
| 505 | return put_uint(argp, bdev_physical_block_size(bdev)); |
| 506 | case BLKIOMIN: |
| 507 | return put_uint(argp, bdev_io_min(bdev)); |
| 508 | case BLKIOOPT: |
| 509 | return put_uint(argp, bdev_io_opt(bdev)); |
| 510 | case BLKALIGNOFF: |
| 511 | return put_int(argp, bdev_alignment_offset(bdev)); |
| 512 | case BLKDISCARDZEROES: |
| 513 | return put_uint(argp, 0); |
| 514 | case BLKSECTGET: |
| 515 | max_sectors = min_t(unsigned int, USHRT_MAX, |
| 516 | queue_max_sectors(bdev_get_queue(bdev))); |
| 517 | return put_ushort(argp, max_sectors); |
| 518 | case BLKROTATIONAL: |
| 519 | return put_ushort(argp, !bdev_nonrot(bdev)); |
| 520 | case BLKRASET: |
| 521 | case BLKFRASET: |
| 522 | if(!capable(CAP_SYS_ADMIN)) |
| 523 | return -EACCES; |
| 524 | bdev->bd_disk->bdi->ra_pages = (arg * 512) / PAGE_SIZE; |
| 525 | return 0; |
| 526 | case BLKRRPART: |
| 527 | if (!capable(CAP_SYS_ADMIN)) |
| 528 | return -EACCES; |
| 529 | if (bdev_is_partition(bdev)) |
| 530 | return -EINVAL; |
| 531 | return disk_scan_partitions(bdev->bd_disk, mode); |
| 532 | case BLKTRACESTART: |
| 533 | case BLKTRACESTOP: |
| 534 | case BLKTRACETEARDOWN: |
| 535 | return blk_trace_ioctl(bdev, cmd, argp); |
| 536 | case IOC_PR_REGISTER: |
| 537 | return blkdev_pr_register(bdev, argp); |
| 538 | case IOC_PR_RESERVE: |
| 539 | return blkdev_pr_reserve(bdev, argp); |
| 540 | case IOC_PR_RELEASE: |
| 541 | return blkdev_pr_release(bdev, argp); |
| 542 | case IOC_PR_PREEMPT: |
| 543 | return blkdev_pr_preempt(bdev, argp, false); |
| 544 | case IOC_PR_PREEMPT_ABORT: |
| 545 | return blkdev_pr_preempt(bdev, argp, true); |
| 546 | case IOC_PR_CLEAR: |
| 547 | return blkdev_pr_clear(bdev, argp); |
| 548 | default: |
| 549 | return -ENOIOCTLCMD; |
| 550 | } |
| 551 | } |
| 552 | |
| 553 | /* |
| 554 | * Always keep this in sync with compat_blkdev_ioctl() |
| 555 | * to handle all incompatible commands in both functions. |
| 556 | * |
| 557 | * New commands must be compatible and go into blkdev_common_ioctl |
| 558 | */ |
| 559 | long blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg) |
| 560 | { |
| 561 | struct block_device *bdev = I_BDEV(file->f_mapping->host); |
| 562 | void __user *argp = (void __user *)arg; |
| 563 | fmode_t mode = file->f_mode; |
| 564 | int ret; |
| 565 | |
| 566 | /* |
| 567 | * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have |
| 568 | * to updated it before every ioctl. |
| 569 | */ |
| 570 | if (file->f_flags & O_NDELAY) |
| 571 | mode |= FMODE_NDELAY; |
| 572 | else |
| 573 | mode &= ~FMODE_NDELAY; |
| 574 | |
| 575 | switch (cmd) { |
| 576 | /* These need separate implementations for the data structure */ |
| 577 | case HDIO_GETGEO: |
| 578 | return blkdev_getgeo(bdev, argp); |
| 579 | case BLKPG: |
| 580 | return blkpg_ioctl(bdev, argp); |
| 581 | |
| 582 | /* Compat mode returns 32-bit data instead of 'long' */ |
| 583 | case BLKRAGET: |
| 584 | case BLKFRAGET: |
| 585 | if (!argp) |
| 586 | return -EINVAL; |
| 587 | return put_long(argp, |
| 588 | (bdev->bd_disk->bdi->ra_pages * PAGE_SIZE) / 512); |
| 589 | case BLKGETSIZE: |
| 590 | if (bdev_nr_sectors(bdev) > ~0UL) |
| 591 | return -EFBIG; |
| 592 | return put_ulong(argp, bdev_nr_sectors(bdev)); |
| 593 | |
| 594 | /* The data is compatible, but the command number is different */ |
| 595 | case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */ |
| 596 | return put_int(argp, block_size(bdev)); |
| 597 | case BLKBSZSET: |
| 598 | return blkdev_bszset(bdev, mode, argp); |
| 599 | case BLKGETSIZE64: |
| 600 | return put_u64(argp, bdev_nr_bytes(bdev)); |
| 601 | |
| 602 | /* Incompatible alignment on i386 */ |
| 603 | case BLKTRACESETUP: |
| 604 | return blk_trace_ioctl(bdev, cmd, argp); |
| 605 | default: |
| 606 | break; |
| 607 | } |
| 608 | |
| 609 | ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp); |
| 610 | if (ret != -ENOIOCTLCMD) |
| 611 | return ret; |
| 612 | |
| 613 | if (!bdev->bd_disk->fops->ioctl) |
| 614 | return -ENOTTY; |
| 615 | return bdev->bd_disk->fops->ioctl(bdev, mode, cmd, arg); |
| 616 | } |
| 617 | |
| 618 | #ifdef CONFIG_COMPAT |
| 619 | |
| 620 | #define BLKBSZGET_32 _IOR(0x12, 112, int) |
| 621 | #define BLKBSZSET_32 _IOW(0x12, 113, int) |
| 622 | #define BLKGETSIZE64_32 _IOR(0x12, 114, int) |
| 623 | |
| 624 | /* Most of the generic ioctls are handled in the normal fallback path. |
| 625 | This assumes the blkdev's low level compat_ioctl always returns |
| 626 | ENOIOCTLCMD for unknown ioctls. */ |
| 627 | long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg) |
| 628 | { |
| 629 | int ret; |
| 630 | void __user *argp = compat_ptr(arg); |
| 631 | struct block_device *bdev = I_BDEV(file->f_mapping->host); |
| 632 | struct gendisk *disk = bdev->bd_disk; |
| 633 | fmode_t mode = file->f_mode; |
| 634 | |
| 635 | /* |
| 636 | * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have |
| 637 | * to updated it before every ioctl. |
| 638 | */ |
| 639 | if (file->f_flags & O_NDELAY) |
| 640 | mode |= FMODE_NDELAY; |
| 641 | else |
| 642 | mode &= ~FMODE_NDELAY; |
| 643 | |
| 644 | switch (cmd) { |
| 645 | /* These need separate implementations for the data structure */ |
| 646 | case HDIO_GETGEO: |
| 647 | return compat_hdio_getgeo(bdev, argp); |
| 648 | case BLKPG: |
| 649 | return compat_blkpg_ioctl(bdev, argp); |
| 650 | |
| 651 | /* Compat mode returns 32-bit data instead of 'long' */ |
| 652 | case BLKRAGET: |
| 653 | case BLKFRAGET: |
| 654 | if (!argp) |
| 655 | return -EINVAL; |
| 656 | return compat_put_long(argp, |
| 657 | (bdev->bd_disk->bdi->ra_pages * PAGE_SIZE) / 512); |
| 658 | case BLKGETSIZE: |
| 659 | if (bdev_nr_sectors(bdev) > ~(compat_ulong_t)0) |
| 660 | return -EFBIG; |
| 661 | return compat_put_ulong(argp, bdev_nr_sectors(bdev)); |
| 662 | |
| 663 | /* The data is compatible, but the command number is different */ |
| 664 | case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */ |
| 665 | return put_int(argp, bdev_logical_block_size(bdev)); |
| 666 | case BLKBSZSET_32: |
| 667 | return blkdev_bszset(bdev, mode, argp); |
| 668 | case BLKGETSIZE64_32: |
| 669 | return put_u64(argp, bdev_nr_bytes(bdev)); |
| 670 | |
| 671 | /* Incompatible alignment on i386 */ |
| 672 | case BLKTRACESETUP32: |
| 673 | return blk_trace_ioctl(bdev, cmd, argp); |
| 674 | default: |
| 675 | break; |
| 676 | } |
| 677 | |
| 678 | ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp); |
| 679 | if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl) |
| 680 | ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg); |
| 681 | |
| 682 | return ret; |
| 683 | } |
| 684 | #endif |